Difficulty in reading for distance or near is the most common sign of an eye problem. You would need to undergo simple vision test to asses your visual status.
If you have any vision problem, your eye muscles tend to work more than needed leading to complaints like headache and eye strain.
Watering can be a common symptom for vision problem as you are constantly straining your eyes to see better.
You might find yourself constantly squinting to see the distance or near letters clearly. This can be easily resolved with a simple vision test and some corrective lenses.
Itching or irritation is a common symptom related to an infection, allergy or inflammation. See a doctor for immediate relief.